MountOne | GOTO Telescope Mount STL Set.

The MountOne & The Four Astrographs.

The MountOne is an astronomical platform with integrated GOTO tracking capabilities, designed to mount Telescopes and Astrographs. I have developed four astrographs alongside the MountOne.

• 100MM Astrograph.
• Pinefeat Astrograph.
• DSLR Astrograph.
• Sky-Watcher SKYMAX 102 OTA Astrograph.

The MountOne GOTO Telescope Mount uses two high performance 0.9° stepper motors coupled to two 5-stage 405:1 belt-driven reduction-drives. This configuration removes almost all backlash in the motion system. The MountOne is able to track with a computed  resolution of 0.25 arcseconds per-step while still being able to slew at 3° a second.

Thirty six bearings across the DEC & RA axes provide smooth and jitter free movement. Genuine Gates 3GT belts are used for each compound stage and are individually tensioned for optimal performance.

Integrated Slip-Rings pass power and signal data between the MountOne and one of four attached astrographs. 

OnStep firmware controls the mount and provides a data-link to a huge range of astronomy software packages via one of the four attached astrographs.

The Printed Equatorial Tripod (PET) provides polar alignment between latitudes of 30-90°.

The MountOne GOTO Telescope Mount, Printed Equatorial Tripod, and Four Astrographs can all be printed on machines with a build volume of 180x180x180 or greater.

The MountOne & The Four Astrographs have taken over 12 months to design, test & develop.

This is not my first 3D printable GOTO mount, these are not my first 3D printable astrographs. If we are counting the tangible only, I think this is mount three (technically four), and the second astrograph (technically third), but if you count each scope separately it's six (technically seven). Anyway, it doesn't really matter. The point is perhaps that there is a chain of development which has landed us here, with The MountOne & The Four Astrographs.

MountOne Specification.

• 0.25 Arcseconds-per-step.
• 0.9° Stepper Motors for both RA & DEC.
• 405:1 Gearless Reduction Drive.
• ~4kg carry capacity.
• Genuine Gates belts.
• 36 Ball Bearings.
• OnStep Telescope Control Software & Electronics.
• 30-90° equatorial tripod available.
• Four developed astrographs to choose from, or design your own.
• Prints in build volumes of 180x180x180 or larger.

Full details on the MountOne Blog Post.

The MountOne STL Set includes basic STLs and calibration prints.

The MountOne Hardware Kit contains the following fixings and electronics.

• 2 x LDO 0.9° Stepper Motors & Cables.
• 4 x 6811-2RS Bearings.
• 32 x MF148ZZ Bearings.
• 10 x 80mm Long, 8mm Diameter Bars.
• 1 x Power Slip-Ring.
• 1 x Signal Slip-Ring.
• 3 x DC Female Sockets
• 2 x DC Male Plugs.
• 1 x DC Male Angled Plug with 2m cable.
• 6 x Gates 3GT 213T Loop-Belts.
• 2 x Gates 3GT 237T Loop-Belts.
• 2 x Gates 3GT 348T Loop-Belts.
• 2 x 20T 3GT Pulleys.
• 72 x M5 20mm Screws for Plastic.
• 24 x M2.5 8mm Screws for Plastic.
• 12 x M3 8mm Countersunk Bolts.
• 4 x M3 10mm Standoffs.
• 4 x M3 5mm Socket Cap Screws.

The Hardware Kit also includes The MountOne CAD Pack.

The MountOne CAD Pack contains all digital resources for the MountOne GOTO Telescope Mount.

• STEP Files, including the Main Assembly.
• STL Files, full sets with all calibration sizes.
• F3Z Fusion Files, the fully-editable Master Assembly.
• PDF Files, Bill-Of-Materials with Fixings & Printed Parts.
• 3MF Files, for Bambu Lab P2S & A1 Mini.

Complete documentation, including printing and assembly guides, is available online

MountOne Documentation.

Use code FREESPOOL with The MountOne Hardware Kit to receive a free DryAF Lite 100% Metal Spool!

Version History.

09/04/2026 | First Release.